norris



UNITED STATES PATENToFrIcE.' f

A. B. NoRRIs, ojr sT. Loursglivrrssouat.

MODE `or OPERATING sawiurmi-BLOCKS;.`yA y t Specification of Letters Patent No. 26,609, dated December 2f?, "1,859.

To all whom t may concern:

Be it known that I, A. B. Nouns, of the city and county of St. Louis and State of Missouri, have invented a new and useful Improvement in Sawmills; and I do hereby declare that the following is a full, clear, and exact description of the same, reference being had to the annexed drawing, making part of this specification, in which- Figure l is a top view of the said invention; Fig. 2, an inverted view of the same, and Fig. 3 a transverse section through A A.

My invention consists of a novel application of levers with vibrating fulcrums, for advancing and when so advanced, holding steadily the slides, or sliding knees, of saw mill head blocks; whereby both ends of the timber to be sawed` may be advanced in front of the saw simultaneously, with greater speed, facility and certainty than that object has hitherto been accomplished..

To enable others skilled in the arts to which my invention appertains to make and use the same, I will proceed to describe the construction and operation thereof.

Similar letters of reference represent corresponding parts of the different figures of the drawing annexed. y

Upon the drawing, A represents the frame of th-e machine (a saw mill carriage), and tsmall wheels upon which the said `carriage rides, and B B are slide rests fixed across the top of the said carriage in the seats Q Q made to receive them. Upon these slide rests the knees P P are placed, so as to slide freely to and fro across the carriage.

Now to operate these knees with `greater speed, facility, and certainty, and to hold them in a fixed position, is the object of my invention; and to effect this object I lay the bar H along the top of the carriage and connect it to the shaft K by means of a rack and pinion R and T (the pinion T being fixed on the shaft K and the rack R on the end of the bar H), andto the shaft K the lever J is fixed, whereby a reciprocating motion is imparted to the bar H, to whichis also attached the lever b, which has a vibrating fulcrum cl, and which is also atwhich works in the under side offtheslide a small vibratinr do r e and also a slidin D i b tached to a small reciprocating carriage f,3

cam c, which when` thrown back allows the` dog e to catch in the rack made in the under side of the kneel), which is thus `thrown forward every double stroke dfthe e l lever J, the dog e being detachedfby throwing the cam a forward.` In the inside of the rest B thereis also` alever u (somewhat in the nature of a cam), fixed upon a center, as shown, and which is operated upon by the boss s upon the carriage fwhen the said carriage moves `back,so as tojam y the knee P and hold it upon restwhennlthe dog e is notactingzandfwhenthe same;

is inoperative, the weight of the ,lever J." `1 through the agency; of thebaruHMthe lever;

acting as the power to secure the lever u,

) with the vibrating fulcrum` d4 The `vibrating fulcrum of lthe lever` i should be justhalf the length of the" said lever, and should be connected to it in the center thereof, and to the rest Bat 5,*upon U the right line 8 running through" the plane upon which the carriage f worksgso that` the fulcrum Z in vibrating upon the-arc"2,"}will cause the bar H, to move `back andforth upon a right line, which is essential in` this connection.

it is necessary to cause the bar `Hto pass .out-` compensate for this discrepancy whichthis difference from the proper lengths ofthe y if lever and fulcrum would occasion, the center 5 of the fulcrum d shouldkbe set a littleto line, at right angles with the line 3.

The fulcrum` and levershown` y upon the drawing, however, arenot made just in this proportion above mentioned, as .I s5. side of the point 5 of the fulcrum. `But to` l f the left of the right line `3,which will allow 1 and cause the bar H towork upona right` Now I am aware thatwvarious modifica f tions of levers with vibrating fulcrums are and have been long in usein hay, cotton, and

printingpresses, and other machinery. I do Y i i i not therefore cla-im a levervwith a vibrating fulcrum as usual, but l i IVhat I claim as my invention 1s" l. The use of a lever with a vibrating ful-` crum, in combination with the dog, or recipocatory carriage f, 0'1" its equivalent, as pose of securing the said knees, substantially the means of communicating motion to the as described. slides or knees P, P, of saw mill head blocks, St. Louis, NOV. 22, 1857.

substantially as described. A. B. NORRIS, 5 2. And I also claim the combination of Witnesses:

the cam lever u With the knee P, and the ROLEIN B. GRAY, manner of operating the samerfor the pur- MOVI Z. ROSSMANN. 

